Lock



Nav. 11, 1924- l 1,515,278

M. F. RIAN LOCK Filed Aug. 14 1923 "ml INFM f M6 will L l g 4 arto: M45

Patented Non. il, i924,

arras MICHAEL F. RYAN, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE 8c TOWNE MANUFACTURING COMPANY, 0F STANFORD, CONNECTICUT.y

LOCK.

Application tiled August 14, 1923. Serial No. 657,277.

To all .whom t may concern.'

Be it known that I, MICHAEL F. RYAN, a citizen of the United States, and a. resident of Stamford, in the county of Fairfield and State of Connecticut, have invented certain new and useful .Improvements in Locks; and

I do hereby declare the following to be a full, clear, and eXactdescription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in locks and more particularly to means for blocking the operation of the bolt-operating cam of a rim lock,one object of the invention being to provide simple and eflicient means whereby the eective throw of the roll back or bolt-operating cam will be prevented in the event that the fastening means for the lock cylinder shall be loosened in an attempt to forcibly wrench or remove the same from the door.

With this and other objects in view, the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings,- y

Figure 1 is a face view of a cover plate for a rim lock illustrating an application of my improvements, and

Figure 2 is al sectional view on the line 2 2 of Figure l.

In the drawing, I have shown a sheet metal back or cover plate 1 having a mounting for a roll back 2 and the latter has suitably connected therewith a roll back or bolt operating cam 3. In proximity to the mounting of the roll back, the cover plate is provided with holes 4L to receive bolts (not shown) for securing a lock cylinder in place.

A blocking device for the bolt operating cam is secured to the cover plate and in the present instance, this device consists of a sheet metal spring plate 5 having an approximately triangular form and secured near its apex to the cover plate by means of a rivet 6. The blocking spring plate 5 is so formed that its normal tendency is to become disposed in the path of movement of the bolt operating cam 3. This spring plate is provided with holes 7 which align with two of the holes 4 in the cover plate so that the head of a securing bolt for the cylinder lock which passes through one or the other of said holes will become seated against the spring plate and compress the latter so that it will be normally disposed out of the path of movement of the bolt-operating cam when the cylinder lock is properly secured in place. 1

ith my improvements, should attempt be made to wrench the cylinder lock from the door, the securing bolt which passes through the spring plate will become sufficiently loosened to permit said plate to spring from its normal position to a position in line with the path of movement of the bolt operating cam and thus prevent the latter from making an effective throw suflicient to withdraw the bolt.

- Having fully described my invention what I claim as new and desire to secure by Letters Patent, is:

1. The combination with the back or cover plate of a rim lock adapted for the reception of securing means for a cylinder lock having a bolt operating cam, of a yielding device carried by the back or cover plate and normally tending to become disposed in the path of movement of the bolt-operating cam of the lock, and to be held out of such position when a cylinder lock is properly secured to said back or cover plate.

2. The combination with the back or cover plate of a rim lock, said back or cover plate having holes for the accommodation of securing bolts for a cylinder lock, and a roll back cam mounted in said back or cover plate, of a spring plate secured to the back or cover plate and normally tending to become disposed in the path of movement of the bolt operating cam, said spring plate having a. hole aligning with a bolt hole in` the back or cover plate, so that a. bolt passing through the aligning holes will hold the spring plate out of the path of movement of the bolt operating cam when a cylinder lock is properly secured in position to the back or cover plate. v

In testimony whereof, I have signed this specification in the presence of a subscribing witness.

MICHAEL F. RYAN.

Witness t EDWARD F. Smits/Anz 

